XML 47 R38.htm IDEA: XBRL DOCUMENT
v3.23.1

Reserved for Future Issuance (Details) - shares | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Stockholders' Equity |  |
Number of shares reserved for future issuance | 9,903,950 | 10,076,610
Series X Preferred Stock |  |
Stockholders' Equity |  |
Number of shares reserved for future issuance | 5,184,591 | 5,242,501
Options outstanding to purchase common stock |  |
Stockholders' Equity |  |
Number of shares reserved for future issuance | 2,562,234 | 2,253,431
Reserve under the 2015 Stock Incentive Plan and the 2022 Inducement Stock Incentive Plan |  |
Stockholders' Equity |  |
Number of shares reserved for future issuance | 1,082,245 | 1,013,520
Warrants for the purchase of common stock |  |
Stockholders' Equity |  |
Number of shares reserved for future issuance | 1,031,820 | 1,530,176
Shares reserved for the employee stock purchase plan |  |
Stockholders' Equity |  |
Number of shares reserved for future issuance | 43,060 | 36,982

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ClassOfStockLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=atxs_SeriesXPreferredStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=atxs_CommonStockOptionsOutstandingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=atxs_ReserveUnderStockIncentivePlanAndInducementStockIncentivePlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=atxs_SharesReservedForFutureIssuanceWarrantsForPurchaseOfCommonStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=atxs_EmployeeStockPurchasePlan2015Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |